Machine for making concrete pipes



CL 4, 1932. A, sAPlN 1,880,360

MACHINE FOR MAKING CONCRETE PIPES Filed Deo. 9. 195oA 2 sheets-sheet l Oct. 4, 1932. A. sPlN MACHINE FOR MAKING CONCRETE PIPES Patented Oct. 4, 1932 'PATE ANTOINE SAPIN, OF UNIEUX, FRANCE MACHINE ron MAKING CONCRETE rrrns- Application filed December 9, 1930, Serial No. 501,011, and ingFrance March 3, 1930.

At present concrete pipes are made by hand tamp-ing the material into lthe space between two coaxial cylindrical surfaces. Such a hand operation is slow and expensive, and further lacks uniformity. The tamping is not uniform over the whole length of the tube however much care is taken. Moreover the successive layers are not homogeneous, through irregularities in the tamping, the dif- 10. ferent p-eriods of adding the material and so forth. It often hap-pens therefore that heterogenous sections are formed in which there are cracks or ssures, the development of which under use or shocks nally leads to complete failure of the tube.

The object of the present invention is a machine for making cylindrical tubes of compressed concrete avoiding the disadvantages above mentioned.

N ot only is the time of fabrication considerably reduced but the products obtained are homogeneous and their thickness absolutely regular over the whole length. It further enables tubes of widely varying diameters and thicknesses to be made.

The accompanying drawings diagrammatically illustrate a simple embodiment of the invention.

Figure 1 is an end elevation.

Figure 2 shows juxtaposed half views in section of the positions of the cylinders at the commencement and end of the operation respectively.

Figure 3 is a front elevation, and

Figure 4 is a plan view.

In the following description for the sake of simplicity no reference is made to parts not necessary for understanding the invention.

A cylindrical core 1 having an end plate 3 fast thereon is stood upright and the washer 2 which moulds the spigot end connection of the tube is placed on the end plate 3. The mould 4 comprising two semi-cylinders abutting on two diametrally opposite edges and held together by devices 5, 5', 5 is placed concentrically round the core. The cylindrical annulus thus formed is now charged with the material from which the tube is to be made. At the top of the core is ving on its axis which remains xed in posiplaced the washer G which forms the socket end ofthe tube.l Finally the cover plate 7 is `placed in position andixed by cotters'S. The mould thus charged and closed is turned f 'on its side and placed on rollers 9, 9, 9, 55

9. In the end plates of the coreare three apertures, Vof which one 10 and 10 serves Afor centreing while the others 11 and 11, and l2 and 12 serve for driving the core.

Driving is effected through shafts 13 and 13 which can slide axially through pulleys driven, for example by a motor. These shafts have Vsuitable pins engaging in the respective sets of apertures 10, 11, 12 and 10', 11 and 12 Levers 14 and 14 through springs l5 and a thorough rolling.

The rollers whose transverse separation can be adjusted as desired according to the diameter of the tube to be made, by means of 'f notches such as 17, 17. symmetrically located with respect to the diametral plane of the machine, are carried on bearings 18, 18 secured on sliding supports 19, 19 which V can be raised or lowered by vertical screws 20, 20 rotatable from a hand wheel 2l through alchain 22 and pinions 23, 23.

The machine being set in action as above described the hand wheel-21 is turned to raise the rollers. The core continues rotat- 151 tion while the external mouldv cylinder carriedby the rollers also continues to rotate about its axis but the latter is displaced parallel with itself in a vertical plane. On the lower side the cylindrical surfaces move o5 closer together under the continuous rise of the rollers. In this region therefore the material is tamped or rolled. y

An indicating hand 24 following the displacement of the rollers shows on a scale ciently stiff to retain the position into which it is rolled.

The machine is then stopped, the levers 14 actuated to disengage the shafts 18, and after the material has set the mould removed and then opened.

As above mentioned the drawings are only given by way of example. The new machine can be considerably varied in the form of its parts, in their dimensions, and in other details without affecting the invention. Vhat I claim is l. In apparatus for making moulded pipes,

the combination of an outer mould cylinder,

a full length core Within said cylinder, means for rotating said core andmeans for relatively radially displacing said core and cylinder with their aXes parallel.

2. In apparatus for making moulded pipes, the combination of an outer cylindrical mould, an inner full length cylindrical core,

means for rotating one of said cylindrical members, and means for relatively radially displacing said cylindrical members with their axes parallel.

3. Apparatus for moulding pipes comprising an outer cylindrical mould, end covers for said mould, a full length cylindrical core in said mould, means for rotating saidy core and means for moving said mould radially with its axis parallel to the aXis of said core.

4. In apparatusfor moulding pipes the combination of an outer hollow mould having its moulding surface in the form of a full length surface of revolution, a corein said mould having its surface in the form of a surface of revolution, means for rotating one Vof said moulding members, and means for relatively radially moving said moulding members with their axes parallel.

5. In apparatus for moulding pipes the combination of an outer hollow mould having its moulding surface in the form of a full length surface of revolution, a core in said mould having its surface in the form of a surface of revolution, means for rotating one of said moulding members, means for relatively radially moving said moulding members with their axes parallel, and means for indicating the extent of said relative movement.

6. In apparatus for moulding hollow bodies of revolution the combination of an outer hollow mouldV having its moulding surface in length core in said mould having its surface in the form of a surface of revolution, means for rotating one of said moulding members, and screw mechanism for moving the other of said moulding members transversely with respect to the first.

7 In apparatus for moulding hollow bodiesof revolution the combination of an outer hollowl mould having its moulding surface in the form of a surface of revolution, a fulllength Vcore in said mould having its surface in the form of a surface of revolution, roller supports for said mould, means for rotating said core, and screw mechanism for moving said rollers in a transverse direction with respect to said moulding members.

8. In apparatus for moulding hollow bodies of revolution the combination of an outer hollow mould having its moulding surface in the form of a surface of revolution, a full length core in said mould having its surface in the form of a surface of revolution, means for rotatably supporting said mould, aligned end shafts adapted to be engaged with and 'disengaged from said core to enable said core to be rotated and said moulding members to be removed, and means for displacing said supporting means transversely with respect to said core.

9. In apparatus for` moulding pipes ther combination of a full length horizontal cylindrical core, a horizontal detachable two part cylindrical mould enclosing said core, rollers rotatably supporting said mould, screw mechanism forl lifting Vand lowering said rollers, and means for rotating said core. V10. In apparatus for moulding pipes the combination of a full length horizontal cylindrical core, a horizontal detachable two part cylindrical mould enclosing said core, rollers rotatably supporting said mould, screw mechanismkfor lifting and lowerin said rollers and aligned end shafts adapte to be engaged with and disengagedV from said core to enable said core to be rotated and said moulding members to'be removed. In testimony whereof I have signed my name to this specification. A. SAPIN.

the form of a surface of revolution, a full 'l 

